Encapsulating the business logic with a POJO façade - POJOs in Action: Developing Enterprise Applications with Lightweight Frameworks - page 274

method directly, HibernatePlaceOrderFacadeResultFactory calls HibernateTem-
plate.initialize() , which is a convenience method that calls Hibernate.ini-
tialize() and converts HibernateException to a Spring data access exception.
Using the HibernateTemplate simplifies the code and makes testing a lot easier
because it can be mocked. In contrast, Hibernate.initialize() is a static method
and impossible to mock.
The HibernatePlaceOrderFacadeResultFactory class extends the Spring class
HibernateDaoSupport and implements the PlaceOrderFacadeResultFactory inter-
face:

public class HibernatePlaceOrderFacadeResultFactory extends
HibernateDaoSupport implements
PlaceOrderFacadeResultFactory {

public HibernatePlaceOrderFacadeResultFactory(
HibernateTemplate hibernateTemplate) {
setHibernateTemplate(hibernateTemplate);
}

Saves HibernateTemplate

public PlaceOrderFacadeResult make(int statusCode,
PendingOrder pendingOrder) {
getHibernateTemplate().
initialize(pendingOrder.
bbbbbbbbbbbbbbb b

Initializes
line items

➥ getLineItems());

Restaurant restaurant =
pendingOrder.getRestaurant();
if (restaurant != null) {
List menuItems =
restaurant.getMenuItems();
getHibernateTemplate().
bbbbbbbbbb b

Initializes optional
menu items

➥ initialize(menuItems);

}
return new PlaceOrderFacadeResult(statusCode, pendingOrder);
}
HibernatePlaceOrderFacadeResultFactory defines a constructor that takes a
HibernateTemplate as a parameter and saves it for later. The make() method ini-
tializes the pending order's line items and the menu items for its restaurant (if it
has one). Unlike its JDO equivalent, HibernatePlaceOrderFacadeResultFactory
needs to have knowledge of the object structure. This isn't a problem in this
example since the object structure is so simple, but a factory that detaches a com-
plex object graph could be quite messy because, as we saw earlier, it would need to
contain conditional logic to handle null references and polymorphic references.